John b



J. B. HASTY.

DRILL FEED MECHANISM.

APPLICATION FILED N 0V. 13. I916.

mmsmx Patented June 24, 1919.

I F 1 B5 II P0 3 9 F 7 11 k 21 JOHN B. HASTY, OF SAN BERNARDINO, CALIFORNIA.

DRILL-FEED MECHANISM.

Specification of Letters Patent.

Patented June 24, 1919.

Application filed November 13, 1916. Serial No. 131,143.

'0 all whom it may concern:

Be it known that 1, JOHN B. HAsTY, a citizen of the United States, and a resident of San Bernardino, in the county of San Bernardino and State of California, have invented certain new. and useful Improvements in Drill-Feed Mechanism, of which the following is a description, reference being had to the accompanying drawing, which forms a part of my specification.

My invention relates to drill-feed mechanism of a drilling machine more especially intended for drilling stay-bolts and similar devices; the invention being illustrated in connection with a drilling machine which may be provided with a multiple of drillfeed devices properly disposed about the table or casing so as to be driven by a powerimparting member common to all the drillchucks, as, for example, illustrated in my application Serial No. 42,684.

The purpose of my invention is to provide a drill-press or machine which isadapted to provide a constant feed and quick release of the drill-controlling means; the construction being adapted to be pneumatically operated and automatically controlled or tripped when the drill has been fed a predetermined distance; these objects and the advantages of my invention being more fully comprehended from the following detailed description of the accompanying drawing wherein v Figure l is a cross sectional view of the upper portion of the frame member, and the drill-feed mechanism; with the portions of the power-imparting mechanism shown in elevation.

Fig. 2 is an elevation of a portion of the right hand side of the machine illustrated in Fig. 1.

Fig. 3 is a detail perspective view partially in section, illustrating a type of metallic washer employed in the air cylinder.

Fig. 4 is a similar view of a flexible or fiber washer employed in the air cylinder.

In the exemplification of the invention as illustrated in the drawing, the frame .of the machine is shown comprising a top plate 8 provided with a central boss, as indicated at 9, and a bottom plate 10 provided with a similar boss 11"; the two plates being secured together and maintained in proper spaced relation by any suitable means, not

shown, so as to provide a suitable housing for the horizontally disposed gearing lower end of the stub shaft 12 is shown provided with a bevel gear 14 which meshes with the bevel gear 15 secured on the end of the horizontally disposed drive shaft 16 which has bearing in the brackets 17 secured to the under side of the bottom plate or member 10; and the drive shaft 16 is shown provided with a belt-receiving pulley 18.

The plates 8 and 10 are provided with corresponding holes for the passage of the spindle 19, the upper end whereof is pro vided with the drill-chuck 20. The openings in the plates 8 and 10 are shown provided with suitable bushings 21 and 22, respeotively; thebushings at, their upper ends being flanged so as to maintain their proper relation with the plates.

In order to providea suitable cushioning for the drill-chuck, I provide a fiber washer 23 on the flange of the bushing 21, so that when the operating medium or air, whereby the drill-chuck is made to travel vertically, is shut off and the drill-chuck 20 allowed to descend, the impact of the descending chuck 20 will. be received by the fiber washer 23 and taken off the bushing 21.

The spindle 19, at a point intermediate of the top and bottom frame members 8 and 10, is shown provided with a pinion 24 feathered thereon by means of the key 25 arranged in the longitudinal slot or key-way 26 in the spindle, so as to permit the vertical travel of the spindle.

-The bottom frame member 10 is shown provided with a spindle casing 27 held in place by means of the flange member or nut 28 which is screwed onto the end of the spindle casing and shown bolted to the bottom frame member 10. The lower end of the casing 27 is provided with acoupling or union member 29 having the inwardly extended wall or diaphra m 30' a short distance removed from the ower orifice of the union; the wall or diaphragm 30 being provided with a central opening for thepassalge of'the piston rod 31. The upper end of t e as shown at 32, which extends into a socket formed in the lower end of the spindle 19 so .as to provide a ball and socket connection between spindle 19 and the piston rod 31; the connection. between the spindle and piston rod being maintained by means of the connecting nut 33 which is preferably locked lace by means of a lock-nut 34. he union 29, secured to the lower end of spindle casing 27, receives the alr cylinder The piston 31 is shown provided with a. key-way 36, preferably extending substantially throughout the length of the pistonrod; and this key-way receives the end of a dowel pin 37 arranged in the diaphragm or wall of the union 29. The dowel pin 37 will allow the piston rod 31 to travel longitudinally 0f the cylinder 35, and at the same time prevents the piston rod 31 rotating on its own axis.

The lower end of the piston rod 31 is provided with a metallic washer 3-8 beneath which is located the washer or packing 39 preferably made of leather or other suitable resilient material. The packing or leather washer 39 is preferably cupped as shown to receive the nut or washer 40; the washer and nut being held in proper relation with each other and the lower end of the piston rod by the jam nut 41 screwed on the end of rod 42, the upper end whereof is screwl threaded and takes into the lower end of the piston 31 as shown in Fig. 1. The rod 42 extends downwardly through the head 43 of the cylinder; and the cylinder head or cap 43 is provided with the metallic washer 44 and leather washer 45 wh-ich'are firmly clamped between the end of the cylinder and cap 43; the washers 4-4 and 45, at the central opening through which the rod 42 passes being formed with the upstanding lips 44 and 45, respectively, as more clearly shown in Figs. 3 and 4, so as to firmly engage the rod 42 when the end of the cylinder is provided with air or other operating medium and thus prevent the escape of such medium about the rod; the cupped washer 45 permitting the rod to readily descend when the operating medium has been shut ofi' and downward pressure on the washers no longer exists.

The lower end of the cylinder 35 is provided with air line 46 entering the side of the cylinder intermediate of the end of the piston 31 and the head 43 of the cylinder; the air line 46 communicating witha suitable source of air supply and provided with a three-way valve 47 whereby the supply of air to the cylinder is controlled; movement of valve 47 to one position allowing the air to flow into the bottom of the cylinder while movement to a second position allows the air to exhaust from'the cylinder and escape through the usual exhaustport in the valve, as indicated at 48. The valve 47 is provided with a handle 49 to which one end of coil spring 50 is secured; the spring 50 being adapted to operate the valve to closed or shut off position, which position allows the air, at the lower end of the cylinder beneath the piston rod, to escape through the port 48 of the valve. Pivotally secured on the frame-member 10 is a, latch member 51 controlled by a suitable spring 52. The latch member 51 is notched, as shown at 53, to receive the end of the handle 49 of the valve, as indicated in dotted lines in Fig. 2; spring 52 maintaining the latch 51 in holdin or latchingrelation with the handle 49, an thereby maintain the valve in open position against the action of sprin 50.

The rod 42 is shown provided with an angularly disposed lower portion and terminates in a sleeve 54 adapted to receive a trip rod 55, maintained in adjustable relation with rod 42 by means of the set screw 56. The trip rod 55 is in vertical alinement with latch member 51, so that when the piston 31 and rod 42 travel upwardly, trip rod 55 will also be made to move upwardly and engage the lower beveled end of latch member 51 and cause the latter to be moved against the action of spring 52 and therefore out of latching engagement with handle 49, of the valve. In order to maintain the trip rod in vertical alinement with latch member 51, I provide the guide 57 ,.which may be secured to the union 29 as shown in Fig. 1, with the outer end of the member 57 provided with an eye or hook to surround the trip rod 55.

By reason of the set screw connection 56 between rod 42 and trip rod 55, it is evident that the trip rod may be adjusted to operate latch member 51 at any predetermined point in the travel of the piston, so that the opcrating medium or air may be shut off and further upward travel of the piston, and therefore also of the chuck spindle, will be prevented. AS is evident from this construction, the feeding mechanism may be adjusted so as to feed the drill-chuck vertically to any predetermined extent, and thus prevent the upward movement of the drill-chuck beyond a given point through carelessness of the operator. It will be understood, of course, that the vertically disposed portion of rod 42 is of a length commensurate with the stroke of the piston, so that the ,piston may be allowed when desired, to travel the full length of the cylinder 35; and as is evident from the construction shown and described, the air admitted to the cylinder between the end of the piston and the head of the cylinder will cause the cupped leather washer to close about or hug the rod 42 and thus prevent the escape of air through the head of the cylinder and cause the piston to travel lengthwise of the cylinder 35 until the trip rod 55 engages latch member 51 and releases the same from engagement with handle 49 of the valve which has been previously drawn down by the operator against the action of its spring 50 until the end of the handle enters the notch 53 of latch member 51.

My invention is more especially intended for drilling stay-bolts, and the. construction shown and described enables the feed mechamsm to be adjusted so as to automatically off through operation of the valve; and while I believe the construction shown and described to be the simplest embodiment of my invention, the same may be modified in certain respects without departing from the scope of the appended claims.

What I claim is 1. Drill-feed mechanism, comprising abed portion, a drill-chuck provided with an elongated spindle rotatably mounted in said bed portion and adapted to travel vertically therethrough, means rotatably mounted in the bed portion whereby the spindle is rotated, said-means being in sliding engagement with the spindle, a spindle casing secured to the bed portion, an aircylinder se- 7 cured to the end of said casing and provided with a piston reciprocatingly mounted in the cylinder and having ball and socket connection with the end of said spindle, means whereby rotation of the piston is revented, and automatically closing means or admitting air to said cylinder intermediate the end of the piston and the cylinder head when said means is in open position and to permit the air to escape from the cylinder when said means is in closed position, said last means being operatively connected with the piston. I

2. Drill-feed mechanism, comprising, in combination with a bed or frame provided with openings, bushings in said openings, a drill-chuck having a spindle mounted in the bushings in said openings, gearing whereby the spindle is rotated, a portion of said gearing being feathered on the spindle so as to permit the latter to move in a lengthwise direction through said portion of gearing, a spindle casing mounted beneath said bed or frame, an air cylinder provided with a piston operatively connected with the spindle, means whereby the air 0 linder is connected to the lower end of said casing, said means being adapted to prevent rotation of the pis the lower end of said cylinder beneath said piston and provided with means for controlling the passage of air therethrough.

3. Drill-feed mechanism, comprlsing, in combination with a bed portion provided with openings having bushings mounted therein, a drill-chuck having an elongated spindle passing through said openings, a spindle casing mounted on the bed portion, an air cylinder secured to the lower end of said casing and provided with a piston operatively connected with said spindle, an air line communicating with the cylinder rearward of the piston, said air line being provided with a spring-controlled valve adapted to normally move to shut ofi position, a spring-controlled member adapted to hold said valve in open position, and means intermediate of said spring-controlled member and piston whereby the former is moved out of holding relation with the valve when the piston reaches a predetermined point in its travel.

4. Drill-feed mechanism, comprising a drill-chuck having an elongated spindle rotatably mounted and arranged to move in a direction lengthwise of the spindle, a spindle casing, an air cylinder provided with a piston operatively connected with said spin dle, means whereby the air cylinder is held in proper relation with said casing, an air line provided with a spring-controlled valve and communicating with the end of the cylinder rearward of the piston, means connected with the free end of the piston and adapted to trip said valve when the piston reaches a predetermined point in its longitudinal travel, and means mounted in the cylinder and about the first mentioned means and adapted to form close contact with said sec-o ond mentioned means through the action of the admitted air.

5. Drill-feed mechanism, comprismg a drill-chuck having an elongated spindle ro-v tatably mounted and adapted to travel in a direction lengthwise of the spindle, a cylinder provided with a reciprocating piston having ball and socket connection with said spindle, means whereby the piston is held against rotation in the cylinder, the end of the cylinder, rearward of the piston, being removable, an air line "connected with the cylinder rearward of the piston and having a three-way valve for controlling the passage .of air to and from the cylinder, the

valve being provided with an exhaust port open when the valve is in normal or closed position, said valve being spring-controlled so as to normally return to closed position, and air from the cylinder permitted to escape through said exhaust port, a spring-controlled latch member for holding the valve in open position, and a tripper rod intermediate of the piston and said latch member whereby the latter is moved out of holding relation with the valve when the piston reaches a predetermined point in its travel.

6. Drill-feed mechanism, comprising, in combination with horizontally disposed frame members, a drill-chuck having an elongated spindle rotatably mounted in said frame members and adapted to travel vertically, a spindle casing secured to the under side of the bottom frame member, an air cylinder provided with a piston having ball and socket connection with the spmdle,

means whereby the air cylinder is secured to and held in vertical alinement with the spindle casing, first means whereby rotation of the piston means adjustably secured in said is prevented, an air line communicating with the lower end of the cylinder rearward of the piston and having a three-way valve for controlling the passage of air to and from the cylinder, said valve being spring controlled so as to normally move to closed and exhausting position, a spring-controlled latch member adapted to hold the valve in open position, and adjustable means intermediate of the piston and said latch member whereby the latter is moved out of latching engagement with the valve when the piston reaches a predetermined point in its travel.

JOHN B. HASTY. Witnesses:

H. J. LAWRENCE, WM. E. YOUNG. 

